111011212111211 has 4 divisors (see below), whose sum is σ = 111011233791624. Its totient is φ = 111011190430800.

The previous prime is 111011212111139. The next prime is 111011212111229. The reversal of 111011212111211 is 112111212110111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111011212111211 - 2¹⁰ = 111011212110187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111011212111211.

It is not an unprimeable number, because it can be changed into a prime (111011212111511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1596176 + ... + 14985666.

It is an arithmetic number, because the mean of its divisors is an integer number (27752808447906).

Almost surely, 2^{111011212111211} is an apocalyptic number.

111011212111211 is a deficient number, since it is larger than the sum of its proper divisors (21680413).

111011212111211 is an equidigital number, since it uses as much as digits as its factorization.

111011212111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21680412.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 111011212111211 its reverse (112111212110111), we get a palindrome (223122424221322).

The spelling of 111011212111211 in words is "one hundred eleven trillion, eleven billion, two hundred twelve million, one hundred eleven thousand, two hundred eleven".